The invention relates to the technical field of under-voltage releases, in particular to a high-voltage under-voltage release, which comprises an electromagnetic compatibility (EMC) circuit, a capacitor charging type starting power circuit, an SA signal sampling circuit, an SB signal sampling circuit, a switching circuit, a microprocessor circuit, an electromagnet and a regulated power circuit, wherein the EMC circuit is connected with a power grid; the SA signal sampling circuit is used for acquiring the voltage of the power grid; the SB signal sampling circuit is used for acquiring the voltage of the output end of the starting power circuit; and the regulated power circuit is used for supplying power to the switching circuit and the microprocessor circuit. The high-voltage under-voltage release has the advantages of circuit simplicity, high starting torque, closing reliability, low coil heat, capabilities of working at a high voltage level and automatically tracking the frequency of the power grid, hot swapping and resistance to short circuit.